Integrated circuit packages and methods of forming the same

ABSTRACT

Provided are integrated circuit packages and methods of forming the same. An integrated circuit package includes at least one first die, a plurality of bumps, a second die and a dielectric layer. The bumps are electrically connected to the at least one first die at a first side of the at least one first die. The second die is electrically connected to the at least one first die at a second side of the at least one first die. The second side is opposite to the first side of the at least one first die. The dielectric layer is disposed between the at least one first die and the second die and covers a sidewall of the at least one first die.

BACKGROUND

In recent years, the semiconductor industry has experienced rapid growthdue to continuous improvement in integration density of variouselectronic components, e.g., transistors, diodes, resistors, capacitors,etc. For the most part, this improvement in integration density has comefrom successive reductions in minimum feature size, which allows morecomponents to be integrated into a given area.

These smaller electronic components also require smaller packages thatoccupy less area than previous packages. Examples of the type ofpackages for semiconductors include quad flat pack (QFP), pin grid array(PGA), ball grid array (BGA), flip chips (FC), three-dimensionalintegrated circuit (3DIC) packages, wafer level packages (WLPs), andpackage on package (PoP) devices. Some 3DICs are prepared by placingdies over dies on a semiconductor wafer level. The 3DICs provideimproved integration density and other advantages, such as faster speedsand higher bandwidth, because of the decreased length of interconnectsbetween the stacked dies. However, there are many challenges related to3DICs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A to FIG. 1G are cross-sectional views of a method of forming anintegrated circuit package in accordance with some embodiments.

FIG. 2 is a cross-sectional view of an integrated circuit package inaccordance with some embodiments.

FIG. 3A to FIG. 3F are cross-sectional views of a method of forming anintegrated circuit package in accordance with some embodiments.

FIG. 4A to FIG. 4D are cross-sectional views of a method of forming anintegrated circuit package in accordance with alternative embodiments.

FIG. 5 is a cross-sectional view of an integrated circuit package inaccordance with alternative embodiments.

FIG. 6 is a cross-sectional view of an integrated circuit package inaccordance with alternative embodiments.

DETAILED DESCRIPTION

The following disclosure provides many different embodiments, orexamples, for implementing different features of the provided subjectmatter. Specific examples of components and arrangements are describedbelow for the purposes of conveying the present disclosure in asimplified manner. These are, of course, merely examples and are notintended to be limiting. For example, the formation of a second featureover or on a first feature in the description that follows may includeembodiments in which the second and first features are formed in directcontact, and may also include embodiments in which additional featuresmay be formed between the second and first features, such that thesecond and first features may not be in direct contact. In addition, thesame reference numerals and/or letters may be used to refer to the sameor similar parts in the various examples the present disclosure. Therepeated use of the reference numerals is for the purpose of simplicityand clarity and does not in itself dictate a relationship between thevarious embodiments and/or configurations discussed.

Further, spatially relative terms, such as “beneath”, “below”, “lower”,“on”, “over”, “overlying”, “above”, “upper” and the like, may be usedherein to facilitate the description of one element or feature'srelationship to another element(s) or feature(s) as illustrated in thefigures. The spatially relative terms are intended to encompassdifferent orientations of the device in use or operation in addition tothe orientation depicted in the figures. The apparatus may be otherwiseoriented (rotated 90 degrees or at other orientations) and the spatiallyrelative descriptors used herein may likewise be interpretedaccordingly.

FIG. 1A to FIG. 1G are cross-sectional views of a method of forming anintegrated circuit package in accordance with some embodiments. It isunderstood that the disclosure is not limited by the method describedbelow. Additional operations can be provided before, during, and/orafter the method and some of the operations described below can bereplaced or eliminated, for additional embodiments of the methods.

Although FIG. 1A to FIG. 1G are described in relation to a method, it isappreciated that the structures disclosed in FIG. 1A to FIG. 1G are notlimited to such a method, but instead may stand alone as structuresindependent of the method.

Referring to FIG. 1A, a first die 100 is provided. The first die 100 mayinclude one or more active components and/or passive components. In someembodiments, the first die 100 may include a logic die, a memory die, aCPU, a GPU, an xPU, a MEMS die, a SoC die, or the like. In someembodiments, the first die 100 includes a semiconductor substrate S1, aplurality of through substrate vias TSV1 and an interconnect structureIS1.

The semiconductor substrate S1 includes an elementary semiconductor suchas silicon, germanium and/or a compound semiconductor such as silicongermanium, silicon carbide, gallium arsenic, indium arsenide, galliumnitride or indium phosphide. The semiconductor substrate S1 may includea silicon-containing material. For example, the semiconductor substrateS1 is a silicon-on-insulator (SOI) substrate or a silicon substrate. Invarious embodiments, the semiconductor substrate Si may take the form ofa planar substrate, a substrate with multiple fins, nanowires, or otherforms known to people having ordinary skill in the art. Depending on therequirements of design, the semiconductor substrate S1 may be a P-typesubstrate or an N-type substrate and may have doped regions therein. Thedoped regions may be configured for an N-type device or a P-type device.The semiconductor substrate S1 includes isolation structures defining atleast one active area, and at least one device is disposed on and/or inthe active area. In some embodiments, the device includes a gatedielectric layer, a gate electrode, source/drain regions, spacers, andthe like.

The through substrate vias (e.g., through silicon vias) TSV1 penetratethrough the semiconductor substrate S1. The through substrate vias TSV1may include Cu, Ti, Ta, W, Ru, Co, Ni, the like, or a combinationthereof. In some embodiments, a seed layer and/or a barrier layer may bedisposed between each through substrate via TSV1 and the semiconductorsubstrate S1. The seed layer may include Ti/Cu. The barrier layer mayinclude Ta, TaN, Ti, TiN, CoW or a combination thereof. In someembodiments, the top portions of the through substrate vias TSV1 extendinto the interconnect structure IS1.

The interconnect structure IS1 may be disposed over a first side (e.g.,front side) of the semiconductor substrate S1. Specifically, theinterconnect structure IS1 may be disposed over and electricallyconnected to the device. In some embodiments, the interconnect structureIS1 includes inter-metal dielectric layers IMD1 and metal featuresembedded in the inter-metal dielectric layers IMD1. The inter-metaldielectric layers IMD1 may include silicon oxide, silicon nitride,silicon oxynitride, a low dielectric constant (low-k) material having adielectric constant less than 3.5, the like, or a combination thereof.The metal features may include Al, Cu, Ti, Ta, W, Ru, Co, Ni, the like,or a combination thereof. In some embodiments, a seed layer and/or abarrier layer may be disposed between each metal feature and thecorresponding inter-metal dielectric layer IMD1. The seed layer mayinclude Ti/Cu. The barrier layer may include Ta, TaN, Ti, TiN, CoW or acombination thereof. In some embodiments, the metal features includeupper pads UP1 configured to bond the first die 100 to the desiredcomponents such as bumps, and lower pads LP1 configured for the throughsubstrate vias TSV1 to land thereon. In some embodiments, the upper padsUP1 and the lower pads LP1 include different materials. For example, theupper pads UP1 may include Al, and the lower pads LP1 may include Cu. Inalternative embodiments, the upper pads UP1 and the lower pads LP1 mayinclude the same material.

A bonding film BF1 is optionally included in the first die 100. Thebonding film BF1 may be disposed over the first side (e.g., front side)of the semiconductor substrate S1. Specifically, the bonding film BF1may be disposed over the interconnect structure IS1. In someembodiments, the bonding film BF1 includes silicon oxide, siliconnitride, the like, or a combination thereof. In another embodiment, apolymer, such as benzocyclobutene (BCB), epoxy, an organic glue, or thelike, is utilized as a bonding material of the bonding film BF1.

Still referring to FIG. 1A, a carrier C1 is provided. The carrier C1 hasa bonding film BF_(C1) formed thereon. In some embodiments, the carrierC1 is a glass substrate or a semiconductor substrate, and the bondingfilm BF_(C1) includes silicon oxide, silicon nitride, the like, or acombination thereof. In another embodiment, a polymer, such asbenzocyclobutene (BCB), epoxy, an organic glue, or the like, is utilizedas a bonding material of the bonding film BF_(C1). In some embodiments,the bonding film BF_(C1) of the carrier C1 includes a material the sameas that of the bonding film BF1 of the first die 100. In alternativeembodiments, the bonding film BF_(C1) of the carrier C1 and the bondingfilm BF1 of the first die 100 may include different materials.

Again referring to FIG. 1A, the first die 100 is bonded to the carrierC1 at the first side (e.g., front side) of the first die 100. The firstdie 100 may be referred to as a tier-1 die in some examples. In someembodiments, the first die 100 is bonded to the carrier C 1 through afusion bonding. Specifically, the bonding film BF1 of the first die 100is bonded to the bonding film BF_(C1) of the carrier C1. However, thedisclosure is not limited thereto, and another bonding technique, suchas direct bonding, metal diffusion, anodic bonding, hybrid bondingincluding a metal-to-metal bonding and a dielectric-to-dielectricbonding, or the like, may be applied.

Referring to FIG. 1B, the semiconductor substrate S1 is partiallyremoved to expose portions (e.g., bottom portions) of the throughsubstrate vias TSV1. In some embodiments, the partial removal operationincludes performing an isotropic etching, such as a dry etching. In someembodiments, the etching gas includes a fluorine-containing gas, such asNF₃, SF₆, CF₄, CHF₃, CH₂F₂, the like or a combination thereof.

In some embodiments, after partially removing the semiconductorsubstrate S1, the interconnect structure IS1 is wider than the remainingsemiconductor substrate S1. Specifically, the partial removal operationnot only removes the bottom portion of the semiconductor substrate S1 toexpose the bottom portions of the through substrate vias TSV1, but alsoremoves the side portion of the semiconductor substrate S1 to expose aportion of the inter-metal dielectric layer IMD1 of the interconnectstructure IS1. In some embodiments, the bonding film BF_(C1) of thecarrier Cl is partially removed during the operation of partiallyremoving the semiconductor substrate S1. Accordingly, the remainingbonding film BF_(C1) is thicker in the central region while thinner inthe edge region thereof.

Referring to FIG. 1C, a dielectric layer DL is formed over the top andthe sidewall of the first die 100 and around the exposed portions (e.g.,bottom portions) of the through substrate vias TSV1. In someembodiments, the dielectric layer DL further extends laterally away fromthe first die 100 and covers the exposed top surface of the bonding filmBF_(C1) of the carrier C1.

The dielectric layer DL of the disclosure not only functions as abonding film for bonding the first die 100 to the desired component suchas a second die, but also functions as an isolation film for isolatingthe first die 100 from undesired components or materials. In someembodiments, the dielectric layer DL may include silicon oxide, siliconnitride, silicon oxynitride, a low-k material having a dielectricconstant less than 3.5 (e.g., carbon doped oxide), the like, or acombination thereof. The method of forming the dielectric layer DLincludes the following operations. A dielectric material layer is formedover the carrier C1 covering the first die 100 through a suitableprocess such as chemical vapor deposition (CVD) or plasma enhanced CVD(PECVD), although any suitable process may be utilized. Thereafter, aplanarization process such as a chemical mechanical polishing (CMP) isperformed to partially remove the dielectric material layer, until thesurfaces (e.g., bottom surfaces) of the through substrate vias TSV1 areexposed.

Referring to FIG. 1D, a second die 200 is provided. The second die 200may include one or more active components and/or passive components. Insome embodiments, the second die 200 may include a logic die, a memorydie, a CPU, a GPU, an xPU, a MEMS die, a SoC die, or the like. Thefunction of the second die 200 may be different from that of the firstdie 100. For example, one of the first and second dies is a logic die,and the other of the first and second dies is a memory die. The firstand second dies may have similar function as needed.

The second die 200 may have a structure similar to that of the first die100, and the materials and configurations thereof may refer to those ofthe first die 100. In some embodiments, the second die 200 includes asemiconductor substrate S2 and an interconnect structure IS2.

The semiconductor substrate S2 may be similar to the semiconductorsubstrate S1, so the material and configuration thereof may refer tothose of the semiconductor substrate S1. In some embodiments, thesemiconductor substrate S2 may have through substrate vias such asthrough silicon vias as needed. In some embodiments, the semiconductorsubstrate S2 includes isolation structures defining at least one activearea, and at least one device is disposed on and/or in the active area.In some embodiments, the width of the semiconductor substrate S2 isgreater than the width of the semiconductor substrate S1, as shown inFIG. 1D. However, the present disclosure is not limited thereto. Inalternative embodiments, the semiconductor substrate S2 is substantiallyas wide as the semiconductor substrate S1. In yet alternativeembodiments, the width of the semiconductor substrate S2 may be lessthan the width of the semiconductor substrate Si as needed.

The interconnect structure IS2 may be similar to the interconnectstructure IS1, so the material and configuration thereof may refer tothose of the interconnect structure IS1. In some embodiments, theinterconnect structure IS2 may be disposed over a first side (e.g.,front side) of the semiconductor substrate S2. Specifically, theinterconnect structure IS2 is disposed over and electrically connectedto the device. In some embodiments, the interconnect structure IS2includes inter-metal dielectric layers IMD2 and metal features embeddedin the inter-metal dielectric layers IMD2. In some embodiments, themetal features include pads P2 configured to bond the second die 200 tothe through substrate vias TSV1 of the first die 100. In someembodiments, the interconnect structure IS2 is substantially as wide asthe interconnect structure IS1, as shown in FIG. 1D. However, thepresent disclosure is not limited thereto. In alternative embodiments,the interconnect structure IS2 and the interconnect structure IS1 mayhave different widths.

Still referring to FIG. 1D, the second die 200 is bonded to the firstdie 100 at a second side (e.g., back side) of the first die 100. Thesecond die 200 may be referred to as a tier-2 die in some examples. Insome embodiments, the second die 200 is bonded to the first die 100through a hybrid bonding including a metal-to-metal bonding and adielectric-to-dielectric bonding. Specifically, the pads P2 of thesecond die 200 is bonded to the through substrate vias TSV1 of the firstdie 100, and the inter-metal dielectric layer IMD2 is bonded to thedielectric layer DL over the first die 100. However, the disclosure isnot limited thereto, and another bonding technique, such as directbonding, metal diffusion, anodic bonding, fusion bonding, or the like,may be applied.

In some embodiments, the second die 200 and the first die 100 arestacked in a face-to-back configuration, as shown in FIG. 1D. However,the disclosure is not limited thereto, and another back-to-backconfiguration may be applied.

Referring to FIG. 1E, a dielectric encapsulation E is formed around thefirst die 100 and the second die 200. The dielectric encapsulation E maybe referred to as a gap filling layer in some examples. In someembodiments, the dielectric encapsulation E includes a molding compound,a molding underfill, a resin or the like. In some embodiments, thedielectric encapsulation E includes a polymer material such aspolybenzoxazole (PBO), polyimide, benzocyclobutene (BCB), the like, or acombination thereof. In alternative embodiments, the dielectricencapsulation E includes silicon oxide, silicon nitride or a combinationthereof. In some embodiments, the method of forming the dielectricencapsulation E includes the following operations. An encapsulationmaterial layer is formed over the carrier C1 covering the first die 100and second die 200 through a suitable process such as molding process ora deposition process, although any suitable process may be utilized.Thereafter, a planarization process such as a chemical mechanicalpolishing (CMP) is performed to partially remove the encapsulationmaterial layer, until the surface (e.g., bottom surface) of thesemiconductor substrate S2 is exposed.

Referring to FIG. 1F, a bonding film BF2 is formed over the second die200 and the dielectric encapsulation E. In some embodiments, the bondingfilm BF2 includes silicon oxide, silicon nitride, the like, or acombination thereof. In another embodiment, a polymer, such asbenzocyclobutene (BCB), epoxy, an organic glue, or the like, is utilizedas a bonding material of the bonding film BF2.

Referring to FIG. 1G, a second carrier C2 is provided. The carrier C2has a bonding film BF_(C2) formed thereon. In some embodiments, thecarrier C2 is a glass substrate or a semiconductor substrate, and thebonding film BF_(C2) includes silicon oxide, silicon nitride, the like,or a combination thereof. The carrier C2 may be referred to as a covermember in some examples. In another embodiment, a polymer, such asbenzocyclobutene (BCB), epoxy, an organic glue, or the like, is utilizedas a bonding material of the bonding film BF_(C2). In some embodiments,the bonding film BF_(C2) of the carrier C2 includes a material the sameas that of the bonding film BF2 over the second die 200. In alternativeembodiments, the bonding film BF_(C2) of the carrier C2 and the bondingfilm BF2 over the second die 200 may include different materials.

Still referring to FIG. 1G, the second carrier C2 is bonded to thesecond die 200. In some embodiments, the carrier C2 is bonded to thesecond die 200 through a fusion bonding. Specifically, the bonding filmBFc₂ of the carrier C2 is bonded to the bonding film BF2 of the seconddie 200. However, the disclosure is not limited thereto, and anotherbonding technique, such as direct bonding, metal diffusion, anodicbonding, hybrid bonding including a metal-to-metal bonding and adielectric-to-dielectric bonding, or the like, may be applied.

Again referring to FIG. 1G, the carrier Cl is removed. In someembodiments, during the operation of removing the carrier C1, thebonding film BF1 of the first die 100 and the bonding film BF_(C1) ofthe carrier Cl are simultaneously removed.

Thereafter, an insulation layer IL is formed over the first side (e.g.,front side) of the first die 100. In some embodiments, the insulatinglayer IL may include silicon oxide or a suitable dielectric material andmay be formed by a suitable deposition process.

Afterwards, a plurality of bumps B is formed at the first side (e.g.,front side) of the first die 100. The bumps B are disposed over andelectrically connected to the upper pads UP1 of the interconnectstructure IS1. In some embodiments, the bumps B include copper, solder,nickel or a combination thereof. In some embodiments, the bumps B may besolder balls, controlled collapse chip connection (C4) bumps, ball gridarray (BGA) balls, micro bumps, electroless nickel-electrolesspalladium-immersion gold technique (ENEPIG) formed bumps, cupper pillar,hybrid bonding bumps, or the like. An integrated circuit package 10 ofthe disclosure is thus completed.

The above embodiments in which the dielectric layer DL is a single layerare provided for illustration purposes, and are not construed aslimiting the present disclosure. Specifically, the dielectric layer DLof the disclosure may be formed to have a multi-layer structure asneeded. In some embodiments, an integrated circuit package 10 a of thedisclosure is formed when the dielectric layer DL in FIG. 1C is formedto have a multi-layer structure including a lower dielectric layer LDLand an upper dielectric layer UDL, as shown in FIG. 2. The lowerdielectric layer LDL and the upper dielectric layer UDL may includedifferent materials and provide different functions. For example, thelower dielectric layer LDL functions as an adhesion film for improvingthe adhesion between the upper dielectric layer UDL and copper orsilicon, and the upper dielectric layer UDL functions as a bonding filmfor bonding the first die 100 to the second die 200. In someembodiments, each of the lower dielectric layer LDL and the upperdielectric layer UDL may include silicon oxide, silicon nitride, siliconoxynitride, a low-k material having a dielectric constant less than 3.5(e.g., carbon doped oxide), the like, or a combination thereof.

The above embodiments in which the integrated circuit package has afirst die bonded to a second die are provided for illustration purposes,and are not construed as limiting the present disclosure. In someembodiments, a die stack including multiple first dies may be providedand then bonded to a second die. In alternative embodiments, the numberof the second dies may be adjusted as needed.

FIG. 3A to FIG. 3F are cross-sectional views of a method of forming anintegrated circuit package in accordance with some embodiments. It isunderstood that the disclosure is not limited by the method describedbelow. Additional operations can be provided before, during, and/orafter the method and some of the operations described below can bereplaced or eliminated, for additional embodiments of the methods.

Although FIG. 3A to FIG. 3F are described in relation to a method, it isappreciated that the structures disclosed in FIG. 3A to FIG. 3F are notlimited to such a method, but instead may stand alone as structuresindependent of the method.

Referring to FIG. 3A, a tier-1 first die 100 is bonded to a carrier C1at a first side (e.g., front side) of the tier-1 first die 100. Theoperation of FIG. 3A is similar to the operation of FIG. 1A, and thedetails are not iterated herein.

Referring to FIG. 3B, the semiconductor substrate S1 of the tier-1 firstdie 100 is partially removed to expose portions of the through substratevias TSV1, and a dielectric layer DL1 is formed over the top and thesidewall of the tier-1 first die 100 and around the exposed portions ofthe through substrate vias TSV1. The operation of FIG. 3B includes theoperations similar to those described in FIG. 1B and FIG. 1C, and thedetails are not iterated herein. In some embodiments, the dielectriclayer DL further extends laterally away from the tier-1 first die 100and covers the exposed top surface of the bonding film BF_(C1) of thecarrier C1. In some embodiments, the dielectric layer DL1 may includesilicon oxide, silicon nitride, silicon oxynitride, a low-k materialhaving a dielectric constant less than 3.5 (e.g., carbon doped oxide),the like, or a combination thereof.

Referring to FIG. 3C, a tier-2 first die 100 is bonded to the tier-1first die 100 at a second side (e.g., back side) of the tier-1 first die100. In some embodiments, the tier-2 first die 100 is bonded to thetier-1 first die 100 through a hybrid bonding including a metal-to-metalbonding and a dielectric-to-dielectric bonding. Specifically, the upperpads UP1 of the tier-2 first die 100 is bonded to the through substratevias TSV1 of the tier-1 first die 100, and the inter-metal dielectriclayer IMD1 of the tier-2 first die 100 is bonded to the dielectric layerDL1 over the tier-1 first die 100. However, the disclosure is notlimited thereto, and another bonding technique, such as direct bonding,metal diffusion, anodic bonding, fusion bonding, or the like, may beapplied.

In some embodiments, the tier-2 first die 100 and the tier-1 first die100 are stacked in a face-to-back configuration, as shown in FIG. 3C.However, the disclosure is not limited thereto, and another back-to-backconfiguration may be applied.

In some embodiments, the upper pads UP1 and the lower pads LP1 of theinterconnect structure IS1 of the tier-2 first die 100 may include thesame material, such as Cu; however, the upper pads UP1 and the lowerpads LP1 of the interconnect structure IS1 of the tier-1 first die 100may include the different materials, such as Al and Cu, respectively.

Thereafter, the semiconductor substrate S1 of the tier-2 first die 100is partially removed to expose portions of the through substrate viasTSV1, and a dielectric layer DL2 is formed over the top and the sidewallof the tier-2 first die 100 and around the exposed portions of thethrough substrate vias TSV1. In some embodiments, the dielectric layerDL2 further covers the dielectric layer DL1 on the sidewall of thetier-1 first die 100, and extends laterally away from the first dies100. In some embodiments, the dielectric layer DL2 may include siliconoxide, silicon nitride, silicon oxynitride, a low-k material having adielectric constant less than 3.5 (e.g., carbon doped oxide), the like,or a combination thereof. In some embodiments, the dielectric layer DL2and the dielectric layer DL1 include the same material and are formed bythe same process, but the disclosure is not limited thereto. Inalternative embodiments, the dielectric layer DL2 and the dielectriclayer DL1 may include different materials as needed.

Referring to FIG. 3D, the tier-3 first die 100 is bonded to the tier-2first die 100 through a hybrid bonding including a metal-to-metalbonding and a dielectric-to-dielectric bonding. Thereafter, thesemiconductor substrate S1 of the tier-3 first die 100 is partiallyremoved to expose portions of the through substrate vias TSV1, and adielectric layer DL3 is formed over the top and the sidewall of thetier-3 first die 100 and around the exposed portions of the throughsubstrate vias TSV1. The operation of FIG. 3D includes the operationssimilar to those described in FIG. 3B and FIG. 3C. In some embodiments,the dielectric layer DL3 further covers the dielectric layer DL2 on thesidewalls of the tier-1 first die 100 and the tier-2 first die 100, andextends laterally away from the first dies 100. In some embodiments, thedielectric layer DL3 may include silicon oxide, silicon nitride, siliconoxynitride, a low-k material having a dielectric constant less than 3.5(e.g., carbon doped oxide), the like, or a combination thereof. In someembodiments, the dielectric layer DL3 and the dielectric layer DL2include the same material and are formed by the same process, but thedisclosure is not limited thereto. In alternative embodiments, thedielectric layer DL3 and the dielectric layer DL2 may include differentmaterials as needed.

Referring to FIG. 3E, the tier-4 first die 100 is bonded to the tier-3first die 100 through a hybrid bonding including a metal-to-metalbonding and a dielectric-to-dielectric bonding. Thereafter, thesemiconductor substrate S1 of the tier-4 first die 100 is partiallyremoved to expose portions of the through substrate vias TSV1, and adielectric layer DL4 is formed over the top and the sidewall of thetier-4 first die 100 and around the exposed portions of the throughsubstrate vias TSV1. The operation of FIG. 3E includes the operationssimilar to those described in FIG. 3B and FIG. 3C. In some embodiments,the dielectric layer DL4 further covers the dielectric layer DL3 on thesidewalls of the tier-1 first die 100, the tier-2 first die 100 and thetier-3 first die 100, and extends laterally away from the first dies100. In some embodiments, the dielectric layer DL4 may include siliconoxide, silicon nitride, silicon oxynitride, a low-k material having adielectric constant less than 3.5 (e.g., carbon doped oxide), the like,or a combination thereof. In some embodiments, the dielectric layer DL4and the dielectric layer DL3 include the same material and are formed bythe same process, but the disclosure is not limited thereto. Inalternative embodiments, the dielectric layer DL4 and the dielectriclayer DL3 may include different materials as needed. In someembodiments, the dielectric layers DL1 to DL4 constitute a dielectriclayer DL. The dielectric layer DL of the disclosure not only functionsas a bonding film for bonding the die 100 to the desired component suchas another die or a redistribution layer structure, but also functionsas an isolation film for isolating the first die 100 from undesiredcomponents or materials.

In view of the foregoing, the operations described in FIG. 3B and FIG.3C are performed three times, and a die stack including tier-1 to tier-4first dies 100 is accordingly formed. The operations described in FIG.3B and FIG. 3C may be repeated as many times as needed, until thedesired number of the first dies 100 is vertically stacked.

Referring to FIG. 3F, a second die 200 is bonded to the topmost firstdie 100 (e.g., tier-4 first die 100) of the die stack at a second side(e.g., back side) of the topmost first die 100. Thereafter, a dielectricencapsulation E is formed around the tier-1 to tier-4 first dies 100.Afterwards, a bonding film BF2 is formed over the second die 200 and thedielectric encapsulation E. A second carrier C2 is then bonded to thesecond die 200. The carrier C1 is removed. In some embodiments, aportion of the dielectric layer DL (e.g., the portion of the dielectriclayer DL1 on the carrier C1) is simultaneously removed during theremoval of the carrier C1. Next, an insulation layer IL is formed overthe first side (e.g., front side) of the lowermost first die 100 (e.g.,tier-1 first die 100). Afterwards, a plurality of bumps B is formed atthe first side (e.g., front side) of the lowermost first die 100 (e.g.,tier-1 first die 100). The operation of FIG. 3F includes the operationssimilar to those described in FIG. 1D to FIG. 1G, and the details arenot iterated herein. An integrated circuit package 10b of the disclosureis thus completed.

The structures of the disclosure are illustrated below with reference toFIG. 1G, FIG. 2 and FIG. 3F.

In some embodiments, an integrated circuit package 10/10a/10b includesat least one first die 100, a plurality of bumps B, a second die 200 anda dielectric layer DL. The bumps B are electrically connected to the atleast one first die 100 at a first side (e.g., front side) of the atleast one first die 100. The second die 200 is electrically connected tothe at least one first die 100 at a second side (e.g., second side) ofthe at least one first die 100. In some embodiments, the (topmost) firstdie 100 and the second die 200 are bonded through a hybrid bondingincluding a metal-to-metal bonding and a dielectric-to-dielectricbonding. The second side is opposite to the first side of the at leastone first die 100.

In some embodiments, the first die 100 includes a semiconductorsubstrate Si and an interconnect structure IS1, and the interconnectstructure IS1 is wider than the semiconductor substrate S1. In someembodiments, the second die 200 includes a semiconductor substrate S2and an interconnect structure IS2, and the interconnect structure IS2 issubstantially as wide as the semiconductor substrate S2. In someembodiments, the semiconductor substrate S2 is wider than thesemiconductor substrate S1. In alternative embodiments, the width of thesemiconductor substrate S2 may be equal to or less than the width of thesemiconductor substrate S1 as needed.

The dielectric layer DL of the disclosure is disposed between the atleast one first die 100 and the second die 200 and covers the sidewallof the at least one first die 100. In some embodiments, the dielectriclayer DL surrounds portions of through substrate vias TSV1 of the atleast one first die 100. In some embodiments, the surface of thedielectric layer DL is substantially coplanar with the surfaces of thethrough substrate vias TSV1.

In some embodiments, as shown in FIG. 1G, the dielectric layer DL is asingle layer. In some embodiments, as shown in FIG. 2 and FIG. 3F, thedielectric layer DL has a multi-layer structure.

In some embodiments, the dielectric layer DL has a stepped sidewall withmultiple turning points. In some embodiments, the dielectric layer DLhas a one-step profile, as shown in FIG. 1G and FIG. 2. In someembodiments, the dielectric layer DL has a multi-step profile, as shownin FIG. 3F. In some embodiments, the dielectric layer DL further extendslaterally away from the first dies 100, as shown in FIG. 3F.

In some embodiments, as shown in FIG. 3F, the at least one first die 100includes a plurality of first dies 100 vertically stacked. In someembodiments, two adjacent first dies 100 are bonded through a hybridbonding including a metal-to-metal bonding and adielectric-to-dielectric bonding. In some embodiments, the dielectriclayer DL on the sidewall of the first die 100 (e.g., tier-1 first die100) away from the second die 200 is thicker than the dielectric layerDL on the sidewall of the first die (e.g., tier-4 first die 100) closeto the second die 200. In some embodiments, the dielectric layer DL isfurther disposed between two adjacent first dies 100.

In some embodiments, the integrated circuit package 10/10a/10b furtherincludes a dielectric encapsulation E disposed around the at least onefirst die 100 and the second die 200, and a carrier C2 disposed over andbonded to the second die 200. In some embodiments, the dielectricencapsulation E is separated from the at least one first die 100 by thedielectric layer DL.

In view of the above, the dielectric layer of the disclosure is disposedbetween the adjacent dies and covers the entire sidewalls of the dies.In some embodiments, the lateral portion of each dielectric layer overthe corresponding die serves as a bonding film for bonding the die tothe desired components, and the stepped sidewall portion of the sameserves as an isolation film for isolating the die from undesiredcomponents or materials. Besides, the method of the disclosure is simpleand compatible with the existing processes.

FIG. 4A to FIG. 4D are cross-sectional views of a method of forming anintegrated circuit package in accordance with alternative embodiments.It is understood that the disclosure is not limited by the methoddescribed below. Additional operations can be provided before, during,and/or after the method and some of the operations described below canbe replaced or eliminated, for additional embodiments of the methods.

Although FIG. 4A to FIG. 4D are described in relation to a method, it isappreciated that the structures disclosed in FIG. 4A to FIG. 4D are notlimited to such a method, but instead may stand alone as structuresindependent of the method.

Referring to FIG. 4A, a first die 101 is provided. The first die 101 mayinclude one or more active components and/or passive components. In someembodiments, the first die 101 may include a logic die, a memory die, aCPU, a GPU, an xPU, a MEMS die, a SoC die, or the like. The first die101 may be similar to the first die 100, and the materials andconfigurations thereof may refer to those of the first die 100. In someembodiments, the first die 101 includes a semiconductor substrate S, aplurality of through substrate vias TSV and an interconnect structureIS.

The semiconductor substrate S may be similar to the semiconductorsubstrate S1, so the material and configuration thereof may refer tothose of the semiconductor substrate S1. In some embodiments, thesemiconductor substrate S includes isolation structures defining atleast one active area, and at least one device is disposed on and/or inthe active area.

The through substrate vias TSV may be similar to the through substratevias TSV1, so the material and configuration thereof may refer to thoseof the through substrate vias TSV1. The through substrate vias (e.g.,through silicon vias) TSV penetrate through the semiconductor substrateS. In some embodiments, the top portions of the through substrate viasTSV extend into the interconnect structure IS.

The interconnect structure IS may be similar to the interconnectstructure IS1, so the material and configuration thereof may refer tothose of the interconnect structure IS1. In some embodiments, theinterconnect structure IS may be disposed over a first side (e.g., frontside) of the semiconductor substrate S. Specifically, the interconnectstructure IS may be disposed over and electrically connected to thedevice. In some embodiments, the interconnect structure IS includesinter-metal dielectric layers IMD and metal features embedded in theinter-metal dielectric layers IMD. In some embodiments, the metalfeatures include upper pads UP configured to bond the first die 101 tothe desired component such as an integrated circuit structure, and lowerpads LP configured for the through substrate vias TSV to land thereon.In some embodiments, the upper pads UP and the lower pads LP include thesame material. For example, the upper pads UP and the lower pads LP mayinclude Cu. In alternative embodiments, the upper pads UP and the lowerpads LP may include different materials.

Still referring to FIG. 4A, an integrated circuit structure IC isprovided. The integrated circuit structure IC may include one or morefunctional devices such as active components and/or passive components.In some embodiments, the integrated circuit structure IC may include alogic die, a memory die, a CPU, a GPU, an xPU, a MEMS die, a SoC die, orthe like. The function of the integrated circuit structure IC may bedifferent from that of the first die 101. For example, one of the firstdie 101 and the integrated circuit structure IC is a logic die, and theother of the first die 101 and the integrated circuit structure IC is amemory die. The first die 101 and the integrated circuit structure ICmay have similar function as needed.

In some embodiments, the integrated circuit structure IC has a dimensiongreater than that of the first die 101, as shown in FIG. 4A. Thedimension may be a height, a width, a size, a top-view area or acombination thereof. However, the present disclosure is not limitedthereto. In alternative embodiments, the integrated circuit structure ICmay have a dimension substantially the same as that of the first die101.

In some embodiments, the integrated circuit structure IC is a single diestructure. The integrated circuit structure IC may be referred to as abottom wafer in some examples. In some embodiments, the integratedcircuit structure IC includes a semiconductor substrate Si, aninterconnect structure ISi and a bonding structure BSi.

The semiconductor substrate Si may be similar to the semiconductorsubstrate S, the material and configuration thereof may refer to thoseof the semiconductor substrate S. The interconnect structure ISi may bedisposed over a first side (e.g., front side) of the semiconductorsubstrate S. Specifically, the interconnect structure IS may be disposedover and electrically connected to the device on and/or in thesemiconductor substrate S. In some embodiments, the interconnectstructure ISi includes inter-metal dielectric layers and metal featuresembedded in the inter-metal dielectric layers.

The bonding structure BSi may be disposed over the first side (e.g.,front side) of the semiconductor substrate Si. Specifically, the bondingstructure BSi may be disposed over and electrically connected to theinterconnect structure ISi. In some embodiments, the bonding structureBSi includes at least one bonding film BFi and bonding metal featuresembedded in the bonding dielectric layer BFi. In some embodiments, thebonding film BFi includes silicon oxide, silicon nitride, a polymer or acombination thereof. In some embodiments, the bonding metal featuresinclude bonding pads BPi electrically connected to the first die 101.The bonding metal features may include Cu, Ti, Ta, W, Ru, Co, Ni, acombination thereof or the like. In some embodiments, a seed layerand/or a barrier layer may be disposed between each bonding metalfeature and the bonding film BFi. The seed layer may include Ti/Cu. Thebarrier layer may include Ta, TaN, Ti, TiN, CoW or a combinationthereof.

Again referring to FIG. 4A, the first die 101 is bonded to theintegrated circuit structure IS at the first side (e.g., front side) ofthe first die 101. In some embodiments, the first die 101 is bonded tothe integrated circuit structure IC through a hybrid bonding including ametal-to-metal bonding and a dielectric-to-dielectric bonding.Specifically, the upper pads UP of the first die 101 is bonded to thebonding pads BPi of the integrated circuit structure IC, and theinter-metal dielectric layer IMD of the first die 101 is bonded to thebonding film BFi of the integrated circuit structure IC. However, thedisclosure is not limited thereto, and another bonding technique, suchas direct bonding, metal diffusion, anodic bonding, fusion bonding, orthe like, may be applied.

In some embodiments, the first die 101 and the integrated circuitstructure IC are stacked in a face-to-face configuration, as shown inFIG. 4A. However, the disclosure is not limited thereto, and anotherface-to-back configuration may be applied.

Referring to FIG. 4B, the semiconductor substrate S of the first die 101is partially removed to expose portions (e.g., bottom portions) of thethrough substrate vias TSV. In some embodiments, the partial removaloperation includes performing an isotropic etching, such as a dryetching. In some embodiments, the etching gas includes afluorine-containing gas, such as NF₃, SF₆, CF₄, CHF₃, CH₂F₂, the like ora combination thereof.

In some embodiments, after partially removing the semiconductorsubstrate S, the interconnect structure IS is wider than the remainingsemiconductor substrate S. Specifically, the partial removal operationnot only removes the bottom portion of the semiconductor substrate S toexpose the bottom portions of the through substrate vias TSV, but alsoremoves the side portion of the semiconductor substrate S to expose aportion of the inter-metal dielectric layer IMD of the interconnectstructure IS. In some embodiments, the bonding film BFi of theintegrated circuit structure IC is partially removed during theoperation of partially removing the semiconductor substrate S.Accordingly, the remaining bonding film BFi is thicker in the centralregion while thinner in the edge region thereof.

Referring to FIG. 4C, a dielectric layer DL is formed over the top andthe sidewall of the first die 101 and around the exposed portions (e.g.,bottom portions) of the through substrate vias TSV. In some embodiments,the dielectric layer DL further extends laterally away from the firstdie 101 and covers the exposed top surface of the bonding film BFi ofthe integrated circuit structure IC.

The dielectric layer DL of the disclosure not only functions as abonding film for bonding the first die 101 to the desired component suchas a redistribution layer structure, but also functions as an isolationfilm for isolating the first die 101 from undesired components ormaterials. In some embodiments, the dielectric layer DL may includesilicon oxide, silicon nitride, silicon oxynitride, a low-k materialhaving a dielectric constant less than 3.5 (e.g., carbon doped oxide),the like, or a combination thereof. The method of forming the dielectriclayer DL includes the following operations. A dielectric material layeris formed over the integrated circuit structure IC covering the firstdie 100 through a suitable process such as chemical vapor deposition(CVD) or plasma enhanced CVD (PECVD), although any suitable process maybe utilized. Thereafter, a planarization process such as a chemicalmechanical polishing (CMP) is performed to partially remove thedielectric material layer, until the surfaces (e.g., bottom surfaces) ofthe through substrate vias TSV1 are exposed.

Referring to FIG. 4D, an dielectric encapsulation E is formed around thefirst die 101 and over the integrated circuit structure IC. In someembodiments, the dielectric encapsulation E is separated from the firstdie 100 or the integrated circuit structure by the dielectric layer DL.

Still referring to FIG. 4D, a redistribution layer structure RDL isformed over the first die 101 and the dielectric encapsulation E. Theredistribution layer structure RDL is formed over the second side (e.g.,back side) of the first die 100. The redistribution layer structure RDLmay be referred to as a back-side redistribution layer structure in someexamples. The redistribution layer structure RDL includes at least onepolymer layer PL and conductive features embedded by the polymer layerPL. The conductive features include upper metal pads UMP configured toelectrically connect to the desired components such as bumps, and lowermetal pads LMP configured to electrically connect to the throughsubstrate vias TSV of the first die 101. In some embodiments, thepolymer layer PL may include a photo-sensitive material such aspolybenzoxazole (PBO), polyimide (PI), benzocyclobutene (BCB), acombination thereof or the like. The polymer layer of the redistributionlayer structure RDL may be replaced by a dielectric layer or aninsulating layer as needed. In some embodiments, the lower metal padsLMP and the upper metal pads UMP may include Cu, Ti, Ta, W, Ru, Co, Ni,a combination thereof or the like. In some embodiments, a seed layerand/or a barrier layer may be disposed between each metal pad and thepolymer layer PM. The seed layer may include Ti/Cu. The barrier layermay include Ta, TaN, Ti, TiN, CoW or a combination thereof.

Still referring to FIG. 4D, bumps B are formed to electrically connectto the redistribution layer structure RDL. The bumps B are electricallyconnected to the first die 101 at a second side (e.g., back side) of thefirst die 101. An integrated circuit structure 20 of the disclosure isthus completed.

The above embodiments in which the dielectric layer DL is a single layerare provided for illustration purposes, and are not construed aslimiting the present disclosure. Specifically, the dielectric layer DLof the disclosure may be formed to have a multi-layer structure asneeded. In some embodiments, an integrated circuit package 20a of thedisclosure is formed when the dielectric layer DL in FIG. 4C is formedto have a multi-layer structure including a lower dielectric layer LDLand an upper dielectric layer UDL, as shown in FIG. 5. The lowerdielectric layer LDL and the upper dielectric layer UDL may includedifferent materials and provide different functions. For example, thelower dielectric layer LDL functions as an adhesion film for improvingthe adhesion between the upper dielectric layer UDL and copper orsilicon, and the upper dielectric layer UDL functions as an isolationfilm for isolating the first die 101 from undesired components ormaterials. In some embodiments, each of the lower dielectric layer LDLand the upper dielectric layer UDL may include silicon oxide, siliconnitride, silicon oxynitride, a low-k material having a dielectricconstant less than 3.5 (e.g., carbon doped oxide), the like, or acombination thereof.

The above embodiments in which the integrated circuit package has afirst die bonded to an integrated circuit structure are provided forillustration purposes, and are not construed as limiting the presentdisclosure. In some embodiments, a die stack including multiple firstdies may be provided and then bonded to an integrated circuit structure.In alternative embodiments, the number of dies included in theintegrated circuit structure may be adjusted as needed.

In some embodiments, the operations described in FIG. 4B and FIG. 4C areperformed two times, and a die stack including tier-1 to tier-2 firstdies 101 is accordingly formed. The operations described in FIG. 4B andFIG. 4C may be repeated as many times as needed, until the desirednumber of the first dies 101 is vertically stacked. Thereafter, aredistribution layer structure RDL is formed over the second side (e.g.,back side) of the topmost first die 101 (e.g., tier-2 first die 101),and bumps B are formed to electrically connect to the redistributionlayer structure RDL. An integrated circuit structure 20b of thedisclosure is thus completed.

The structures of the disclosure are illustrated below with reference toFIG. 4D, FIG. 5 and FIG. 6.

In some embodiments, an integrated circuit package 20/20 a/20 b includesat least one first die 101, an integrated circuit structure IC, adielectric layer DL and a plurality of bumps B. The at least one firstdie 101 is bonded to the integrated circuit structure IC at a first side(e.g., front side) of the at least one first die 101. In someembodiments, the (lowermost) first die 101 and the integrated circuitstructure IC are bonded through a hybrid bonding including ametal-to-metal bonding and a dielectric-to-dielectric bonding. Thedielectric layer DL covers the top and the sidewall of the at least onefirst die 101. The bumps B are electrically connected to the (topmost)first die 101 at a second side (e.g., back side) of the first die 101.The second side is opposite to the first side of the at least one firstdie 101.

In some embodiments, the first die 101 includes a semiconductorsubstrate S and an interconnect structure IS, and the interconnectstructure IS is wider than the semiconductor substrate S. In someembodiments, the integrated circuit structure IC includes asemiconductor substrate Si and an interconnect structure ISi, and theinterconnect structure ISi is substantially as wide as the semiconductorsubstrate Si. In some embodiments, the semiconductor substrate Si iswider than the semiconductor substrate S.

In some embodiments, the integrated circuit package 20/20 a/20 b furtherincludes a redistribution layer RDL between the second side (e.g., backside) of the topmost first die 101 and the bumps B.

The dielectric layer DL of the disclosure is disposed between thetopmost first die 101 and the redistribution layer structure RDL andcovers the sidewall of the at least one first die 100. In someembodiments, the dielectric layer DL surrounds portions of throughsubstrate vias TSV of the at least one first die 101. In someembodiments, the surface of the dielectric layer DL is substantiallycoplanar with the surfaces of the through substrate vias TSV.

In some embodiments, as shown in FIG. 4D, the dielectric layer DL is asingle layer. In some embodiments, as shown in FIG. 5 and FIG. 6, thedielectric layer DL has a multi-layer structure.

In some embodiments, the dielectric layer DL has a stepped sidewall withmultiple turning points. In some embodiments, the dielectric layer DLhas a one-step profile, as shown in FIG. 4D and FIG. 5. In someembodiments, the dielectric layer DL has a multi-step profile, as shownin FIG. 6. In some embodiments, the dielectric layer DL further extendslaterally away from the first dies 101, as shown in FIG. 4D, FIG. 5 andFIG. 6.

In some embodiments, as shown in FIG. 6, the at least one first die 101includes a plurality of first dies 101 vertically stacked. In someembodiments, two adjacent first dies 101 are bonded through a hybridbonding including a metal-to-metal bonding and adielectric-to-dielectric bonding. In some embodiments, the dielectriclayer DL on the sidewall of the first die 101 (e.g., tier-1 first die101) close to the integrated circuit structure IC is thicker than thedielectric layer DL on the sidewall of the first die (e.g., tier-2 firstdie 101) away from the integrated circuit structure IC. In someembodiments, the dielectric layer DL is further disposed between twoadjacent first dies 101.

In some embodiments, the integrated circuit package 20/20 a/20 b furtherincludes a dielectric encapsulation E disposed around the at least onefirst die 101 and over the integrated circuit structure IC. In someembodiments, the dielectric encapsulation E is separated from the atleast one first die 101 by the dielectric layer DL.

In view of the above, the dielectric layer of the disclosure is disposedbetween the adjacent dies and between the topmost die and theredistribution layer structure, and covers the entire sidewalls of thedies. In some embodiments, each dielectric layer over the correspondingdie serves as an isolation film for isolating the die from undesiredcomponents or materials. Besides, the method of the disclosure is simpleand compatible with the existing processes.

Many variations of the above examples are contemplated by the presentdisclosure. It is understood that different embodiments may havedifferent advantages, and that no particular advantage is necessarilyrequired of all embodiments.

In accordance with some embodiments of the present disclosure, anintegrated circuit package includes at least one first die, a pluralityof bumps, a second die and a dielectric layer. The bumps areelectrically connected to the at least one first die at a first side ofthe at least one first die. The second die is electrically connected tothe at least one first die at a second side of the at least one firstdie. The second side is opposite to the first side of the at least onefirst die. The dielectric layer is disposed between the at least onefirst die and the second die and covers a sidewall of the at least onefirst die.

In accordance with alternative embodiments of the present disclosure, anintegrated circuit package includes at least one first die, anintegrated circuit structure, a dielectric layer and a plurality ofbumps. The at least one first die is bonded to the integrated circuitstructure at a first side of the at least one first die. The dielectriclayer covers a top and a sidewall of the at least one first die. Thebumps are electrically connected to the at least one first die at asecond side of the at least one first die. The second side is oppositeto the first side of the at least one first die.

In accordance with yet alternative embodiments of the presentdisclosure, a method of forming an integrated circuit package includesthe following operations. At least one first die is bonded to a firstcarrier at a first side of the at least one first die, and the first dieincludes a first semiconductor substrate, a plurality of first throughsubstrate vias penetrating through the first semiconductor substrate anda first interconnect structure over the first substrate. The firstsemiconductor substrate is partially removed to expose portions of thefirst through substrate vias. A dielectric layer is formed over a topand a sidewall of the at least one first die and around the exposedportions of the first through substrate vias. A second die is bonded tothe at least one first die at a second side of the at least one firstdie.

Other features and processes may also be included. For example, testingstructures may be included to aid in the verification testing of the 3Dpackaging or 3DIC devices. The testing structures may include, forexample, test pads formed in a redistribution layer or on a substratethat allows the testing of the 3D packaging or 3DIC, the use of probesand/or probe cards, and the like. The verification testing may beperformed on intermediate structures as well as the final structure.Additionally, the structures and methods disclosed herein may be used inconjunction with testing methodologies that incorporate intermediateverification of known good dies to increase the yield and decreasecosts.

The foregoing outlines features of several embodiments so that thoseskilled in the art may better understand the aspects of the presentdisclosure. Those skilled in the art should appreciate that they mayreadily use the present disclosure as a basis for designing or modifyingother processes and structures for carrying out the same purposes and/orachieving the same advantages of the embodiments introduced herein.Those skilled in the art should also realize that such equivalentconstructions do not depart from the spirit and scope of the presentdisclosure, and that they may make various changes, substitutions, andalterations herein without departing from the spirit and scope of thepresent disclosure.

1. An integrated circuit package, comprising: at least one first die; aplurality of bumps electrically connected to the at least one first dieat a first side of the at least one first die; a second die electricallyconnected to the at least one first die at a second side of the at leastone first die, wherein the second side is opposite to the first side ofthe at least one first die; and a dielectric layer disposed between theat least one first die and the second die and covering a sidewall of theat least one first die.
 2. The integrated circuit package of claim 1,wherein the first die comprises a first semiconductor substrate and aplurality of first through substrate vias penetrating through the firstsemiconductor substrate, and the dielectric layer surrounds portions ofthe first through substrate vias.
 3. The integrated circuit package ofclaim 2, wherein the first die further comprises a first interconnectstructure between the bumps and the first semiconductor substrate, andthe first interconnect structure is wider than the first semiconductorsubstrate.
 4. The integrated circuit package of claim 1, furthercomprising: a dielectric encapsulation disposed around the at least onefirst die and the second die; and a carrier disposed over and bonded tothe second die.
 5. The integrated circuit package of claim 1, whereinthe at least one first die comprises a plurality of first diesvertically stacked, and the dielectric layer on a sidewall of the firstdie away from the second die is thicker than the dielectric layer on asidewall of the first die close to the second die.
 6. The integratedcircuit package of claim 6, wherein the dielectric layer is furtherdisposed between two adjacent first dies.
 7. The integrated circuitpackage of claim 1, wherein the dielectric layer has a stepped sidewallwith multiple turning points.
 8. The integrated circuit package of claim1, wherein the dielectric layer has a multi-layer structure.
 9. Theintegrated circuit package of claim 1, wherein the first die comprises afirst semiconductor substrate, the second die comprises a secondsemiconductor substrate, and the second semiconductor substrate is widerthan the first semiconductor substrate.
 10. An integrated circuitpackage, comprising: an integrated circuit structure; at least one firstdie bonded to the integrated circuit structure at a first side of the atleast one first die; a dielectric layer covering a top and a sidewall ofthe at least one first die; and a plurality of bumps electricallyconnected to the at least one first die at a second side of the at leastone first die, wherein the second side is opposite to the first side ofthe at least one first die.
 11. The integrated circuit package of claim10, wherein the first die comprises a first semiconductor substrate anda plurality of first through substrate vias penetrating through thefirst semiconductor substrate, and the dielectric layer surroundsportions of the first through substrate vias.
 12. The integrated circuitpackage of claim 11, wherein the first die further comprises a firstinterconnect structure between the integrated circuit structure and thefirst semiconductor substrate, and the first interconnect structure iswider than the first semiconductor substrate.
 13. The integrated circuitpackage of claim 10, wherein the dielectric layer further extendslaterally away from the at least one first die.
 14. The integratedcircuit package of claim 10, wherein the at least one first diecomprises a plurality of first dies vertically stacked, and thedielectric layer on a sidewall of the first die close to the integratedcircuit structure is thicker than the dielectric layer on a sidewall ofthe first die away from the integrated circuit structure.
 15. Theintegrated circuit package of claim 14, wherein the dielectric layer isfurther disposed between two adjacent first dies.
 16. The integratedcircuit package of claim 10, wherein the dielectric layer has a steppedsidewall with multiple turning points.
 17. (canceled)
 18. (canceled) 19.(canceled)
 20. (canceled)
 21. An integrated circuit package, comprising:a plurality of first dies stacked on one another; and a dielectric layercovering sidewalls of the plurality of first dies and having a steppedprofile.
 22. The integrated circuit package of claim 21, wherein thedielectric layer is further disposed between two adjacent first dies.23. The integrated circuit package of claim 21, wherein the dielectriclayer on the sidewalls of the plurality of first dies is graduallyvaried from a bottommost first die to a topmost first die.
 24. Theintegrated circuit package of claim 21, wherein an interconnectstructure is wider than a semiconductor substrate of each of theplurality of first dies.